package com.foreknow.demo9.Round;

public class TestCircle {
    public static void main(String[] args) {
        Circle c = new Circle(3);
        System.out.println("半径为3的圆的面积是"+c.getArea());
        System.out.println("半径为3的圆的周长为"+c.getCircumference());
    }
}
